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  1. pma

    Is Digital Audio Transmission Analog? [video]

    We can, quite easily, find the differences in the RF induced artifacts which lay almost always high above audible spectrum. And we can also find the artifacts inside the audible spectrum if we speak about link level cables due to differences in signal return impedances.
  2. pma

    Liquid metal speaker cable - technological breakthrough

    I am curious if anyone has considered this thread serious :D.
  3. pma

    Liquid metal speaker cable - technological breakthrough

    We have some scientific sources on this [;)] : https://www.tandfonline.com/doi/abs/10.1080/14786436608213149 https://journals.aps.org/pr/abstract/10.1103/PhysRev.111.476 Summarized: Thermal conductivity 8.30 W/(m⋅K) Electrical resistivity 961 nΩ⋅m (at 25 °C) Magnetic ordering...
  4. pma

    Liquid metal speaker cable - technological breakthrough

    What do you think?
  5. pma

    Liquid metal speaker cable - technological breakthrough

    I would greatly appreciate your advice, John. This is the only weak point of the concept. Maybe mercury filled copper tubes in the power amp with mercury-to-copper direct electron transition?
  6. pma

    Liquid metal speaker cable - technological breakthrough

    As We audiophiles know, the most important component of the audio chain that affect the resulting sound are CABLES. Take or leave, this is a naked truth. And, any good audiophile knows that the biggest enemy of the clear, fluent sound are crystal boundaries that create microdiodes in the cable...
  7. pma

    JBL Live 460NC Wireless Headphones Review

    Wireless vs. wired mode Let's talk about differences in wireless and wired mode. There is a big advantage of the wireless mode (Bluetooth V5.0 here), that we get rid off the annoying cable connecting the headphones with the DAC, or PC, or phone. However, there are some drawbacks that should be...
  8. pma

    Why do records sound so much better than digital?

    It is just not true. It is only your personal feeling and opinion.
  9. pma

    Marchaudio P501 Mono Block Power Amplifier Review

    How about to make a poll, the question would be at which point/level to measure maximum power. Voting would be open only to those who are actively involved in amplifier design, testing and measuring.
  10. pma

    Marchaudio P501 Mono Block Power Amplifier Review

    Oh no, that’s a misunderstanding. There is absolutely no reason for class A solid state amplifier to have softer clipping. Class A is only about idle current value. You would need to add soft clipping circuits to get “soft clipping”.
  11. pma

    Marchaudio P501 Mono Block Power Amplifier Review

    …. and this distortion in isolation would be in almost any case inaudible. FR modulation due to higher output impedance might be audible. Harmonic low order distortion as shown will be inaudible on music signal. This was shown many times. So again - rated power cannot be automatically measured...
  12. pma

    Marchaudio P501 Mono Block Power Amplifier Review

    Because in many cases, like typical tube amplifiers, such method is a nonsense. Is this a 1W amplifier??? https://www.stereophile.com/content/octave-jubilee-mono-se-monoblock-power-amplifier-measurements
  13. pma

    JBL Live 460NC Wireless Headphones Review

    I have made an attempt to measure THD (blue) and THD+N (green) vs. input level at 1kHz, in Bluetooth mode, with NC off. X-axis calibration is in dBFS re source digital output level. Headphone volume is set to maximum by means its arrow up button. Of course, noise level is affected by the...
  14. pma

    Is Digital Audio Transmission Analog? [video]

    Exactly! For the testing purposes that needed shortest impulse edges, we used avalanche transistors to switch (short) DC via a resistor and got a sub-nanosecond edge. For testing high current shunts, mercury wet realy was used to do a similar job.
  15. pma

    JBL Live 460NC Wireless Headphones Review

    The measurements above were in the direct mode, with headphones connected via a cable. In the bluetooth mode, we use internal electronics of the headphones and we may see much more high order distortion components: Their level, however, remains quite low in case of intermodulation distortion:
  16. pma

    JBL Live 460NC Wireless Headphones Review

    JBL Live 460NC Wireless headphones The JBL Live 460NC Wireless are on-ear headphones with active noise cancelling (ANC). Technical Specifications (according to the manufacturer) Driver size: 40mm/1.57" Dynamic Driver Power supply: 5V, 1A Weight: 210g/0.46 lbs Battery...
  17. pma

    What to do about the ABX test?

    That’s really not very sophisticated, right?
  18. pma

    What to do about the ABX test?

    And even more, why to prepare ABX test files for the forum?? It is time consuming, takes a lot of effort to make it properly with the test setup, level matching, time aligning of the files and what is the outcome? 2 - 5 members will take part in the tests and even less would post their abx...
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